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. 2011 May 10;6(5):e19757. doi: 10.1371/journal.pone.0019757

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Bossan et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) strains and are bidirectionally incompatible: Neither nor has the key to each other's lock. (B) and are unidirectionally incompatible: has the key to 's lock, but does not have the key to 's lock.

Inline graphic — (A) strains and are bidirectionally incompatible: Neither nor has the key to each other's lock. (B) and are unidirectionally incompatible: has the key to 's lock, but does not have the key to 's lock.